I dont know if I should be concerned about this or not, so I thought Id make a post. Dorian is 7 months old now and is an unaltered male. Iv recently noticed a darker patch of skin on his testicles and Im wondering if it should be cause for concern? His father I noticed has darker colored testicles but his older brother doesnt, so I not sure what to think of it. May be a stupid question, but do they change color at all as they age?